Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Tuner Pro: Guitar Tuner & Tab
Unlock perfect guitar tuning in seconds! Nail every note with our easy-to-use tuner, now powered by AI
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
46,177 ratings · Top 15%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Tuner Pro: Guitar Tuner & Tab: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Unlock perfect guitar tuning in seconds! Nail every note with our easy-to-use tuner, now powered by AI. Learn chords and play your favorite songs instantly. No cables, no fuss. Just your phone and your instrument. Whether you're a beginner or a pro, Tuner Pro helps you sound your best. Why You'll Love It: - Tune your guitar, bass, or ukulele with ease. - Practice with AI chord and lyric generation. - Learn quickly with manual or automatic modes. Top Features: - Chromatic tuner for all instruments. - Accuracy of +/- 0.5 hundredth. - Tuning range: Ab1 (51.91 Hz) - D5 (587.32 Hz). - Discover 2640 chords. - Visualize chords with our extensive library. - Metronome with Time Signature and Subdivisions settings. - Games to learn chords visually. Ready to take your playing to the next level? Download Tuner Pro now! The premium subscription unlocks the following features: - 2500+ chords library unlocked: visualize how to play ANY chord with your instrument, listen to how it should sound - All features unlocked for the metronome (tap tempo, subdivisions) - Full access to games & trainings: these are great way to learn chords by heart and where to put your fingers on the fretboard - Ads removed Privacy Policy and Terms of use: http://musicworldmedia.com/products/tuner/tos
Written user reviews are not shown here. Check current App Store reviews >
Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Include presets for various string instruments and customizable tunings.
Assumption to check: Limited tuning options for different instruments
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the calibration with guided steps and visual aids.
Assumption to check: Calibration process can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free subscription model with additional features.
Assumption to check: Ads can disrupt user experience
Validate with people who use this workflow before building.
Hypothesis 4
Integrate sharing options for users to share their tuning settings or achievements.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
React Navigation
react-native-sound
expo-av
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
